A fortress is easier to protect because it's simpler: it has no windows, few doors, no skylights, or vent systems through which an intruder might sneak.
堡垒的保护更容易因为它构造更简单：它没有窗口、几乎没有几道门，没有天窗或通风系统这些入侵者可能利用的东西。
Windows and doors should be opened in order to vent the blast if detonation should occur.
窗户和门应保持打开，以备爆炸发生后迅速消散烟雾。
Analyzed press technology characteristics of vent-windows of the car side board, designed a lancing-drawing compound die.
分析了车厢侧板零件通风窗冲压加工的工艺特点，设计了一副针对该零件加工的切口拉伸复合模。
Analyzed press technology characteristics of vent-windows of the car side board, designed a lancing-drawing compound die.
分析了车厢侧板零件通风窗冲压加工的工艺特点，设计了一副针对该零件加工的切口拉伸复合模。
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